Locking device for the positive holding of a cover or grate in a frame
US5071177A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 1, 1988 |
| Grant date | Dec 10, 1991 |
| Priority date | — |
| Expiry date | Dec 1, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T292/1045
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In a cover-frame assembly for a manhole or the like a locking device is provided, which comprises a closing member having at least two horizontal arms and a mounting rod provided with a bearing and actuating device. The mounting rod and the bearing and actuating device are located in a bore having a widened bore portion, whereby a shoulder is formed, on which is supported a bearing surface of the bearing and actuating device. The ends of the arms each project into a guide link, which is shaped on the inner flange of the frame. The guide link has an inclined flank, by means of which the arms are increasingly elastically deformed. In the closed position of the locking device, the arms engage in locking recesses provided on the end of each inclined flank. This leads to a self-closure with pre-tension.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.